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Kerberos credentials manager should notify observers if at least one of the
account addition succeed. Howerver, there should be at most one notification
for a given list of accounts added. This CL adds a flag to manage this
notifications.

Change-Id: I6f40ed930dd98e9f760a9de9869452d94cec4295
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1871881
Commit-Queue: Felipe Andrade <fsandrade@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708203}